Is this bone from the right or left side of the body?

Question

BlackTom AI · Accepted Answer

The key landmark is the glenoid fossa (the rounded articular surface) at the lateral angle of the scapula; the spine and acromion are posterior, and the coracoid process is an anterior projection. Orient the bone so the smooth glenoid faces laterally (toward the humeral head) and the spine/acromion lie posteriorly — that determines right vs. left.

1) Relevant knowledge points and concepts
- Glenoid fossa = lateral articulation with humerus.
- Spine and acromion = posterior ridge and posterior-most projection.
- Coracoid process = anterior projection that lies above the glenoid.
- Medial (vertebral) border = long, concave edge toward the midline of the body.

2) Step-by-step reasoning with the pictured bone
- Locate the glenoid region: in the photo it is at the upper-right portion of the bone (the rounded articular area beneath the acromion).
- Identify the spine/acromion: a flat posterior ridge extends over and behind the glenoid (visible as the shelf-like structure above the glenoid).
- Identify the coracoid: a hooked projection anterior to the glenoid is present (slightly anterior to and projecting from the same lateral angle).
- Identify the long, broad body of the scapula extending inferiorly and medially (the blade) which would sit against the posterior thoracic wall.

3) Intermediate orientation step
- With the glenoid facing laterally, the spine/acromion are posterior. In the photo those posterior structures project toward the viewer’s right side of the image; thus when placed in anatomical position the lateral (glenoid) surface is turned to the left side of the person.

4) Why the correct answer is correct
- Because the glenoid and associated coracoid/acromion in this specimen orient so that the articular surface would face left when the spine is posterior, the bone corresponds to the left scapula.

5) Why the other option is incorrect
- “Right” would require the glenoid/coracoid to face the opposite direction when the spine is posterior. The pictured relationships of spine, coracoid and blade do not match a right scapula.

Conclusion: The scapula shown is from the Left side of the body (correct answer: Left).

Is this bone from the right or left side of the body? 单项选择题

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